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08-24-2003, 08:50 PM | #1 |
Workin to live...
Join Date: Jun 2003
Location: Texas Hill Country
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Q: New radiator, but no heater hose nipple!
Gotta new 4-core radiator for the Jimmy from PartsAmerica but there's no prevision for the return heater hose. Can I just run it back to the water pump, instead?
Thanks guys, and great forum!
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Jason |
08-24-2003, 08:57 PM | #2 |
Gotta Startem Early
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Location: Amarillo, TX, USA
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No, the water needs to make a complete circle that goes through the engine and then through the radiator. If you send it right back into the pump then it will never cool off.
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08-24-2003, 09:02 PM | #3 |
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So, then how do I get this back to the tank? Do I need to go have a new nipple fitted to the new radiator for this hose?
Guess I know why I only paid $150 for this thing now!
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Jason Last edited by Cap'n Hook; 08-24-2003 at 09:17 PM. |
08-24-2003, 09:21 PM | #4 |
CCRider
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Yes you can run it off the intake and back to the water pump...that's how mine was run from the factory. I have never seen a 67-72 that had the nipple on the radiator from the factory, I aways thought that was a 73 up thing,[and the radiator will bolt right in] but these trucks were built at several different places so there is no telling
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08-24-2003, 09:31 PM | #5 |
huh?
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I agree with Tom. Millions of GM cars/trucks have one hose running to the pump, and the other to the tank. You should have no problems doing it that way.
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08-24-2003, 09:35 PM | #6 |
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Ya'll are confusing me! Ok, the intake is already used to feed the heater core, and the return line was going back to the radiator, directly from the heater core. Now this new radiator doesn't have a prevision for this return line from the heater core, so I was gonna run it to one of the two holes in the water pump, one being on top and the other on the passenger side of the water pump, using the latter of the two! Seems to me, once the thermostat opens up, all the coolant will be cooled!? Yes/No?
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Jason |
08-24-2003, 09:49 PM | #7 |
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Yes run it to the hole on the passenger side of the waterpump it will work fine...this is for the heater it has nothing to do with cooling the engine
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72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS |
08-24-2003, 09:59 PM | #8 |
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Just a question, but then why did the radiator Im replacing have the return heater core hose running to the radiator? Maybe a wrong replacement radiator previously, or something of the nature?
And I'll be picking up some new parts tomorrow, including the thermostat housing, thermostat and upper and lower radiator hoses, and the bung to fit the water pump for the return heater hose! Im thinking 195 degrees is a bit too hot to run here in Texas summer heat, but 160 is too cool for winter. So I'm gonna pickup a 185 thermo! These have to be the original thermostat housing and metal upper radiator hose, cuz they both have rusted pieces inside them, some pieces bigger than my small finger nail!
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Jason Last edited by Cap'n Hook; 08-24-2003 at 10:03 PM. |
08-24-2003, 10:00 PM | #9 |
Inline 69
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did you order the correct radiator????????????
manual tranny and auto tranny radiators are hooked up differently,,,,,,,,,,,,,,,,,,,,,,,,,,
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08-24-2003, 10:03 PM | #10 |
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It seem's to me the truck's with automatic's had the hose going to the radiator and manual's had the water pump action going.. But I could be way off base.
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08-24-2003, 10:07 PM | #11 |
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Most of the trucks I have had the radiator had a port on it for the heater. The aftermarket radiators I have ordered do not have this port on them now.I wonder if anyone makes it that way anymore.I have had to use the spare port on the water pump.That plug on the water pump is kind of hard to unscrew after 30 some years
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08-24-2003, 10:28 PM | #13 |
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you might of ordered the wrong type
they are routed differently.........jeff
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08-25-2003, 12:01 AM | #14 |
Low & Slow
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That's interesting! I've got the typical v8 manual trans hose setup on mine. It is a factory 350 w/ th-350 tranny. I'm guessing the radiator was replaced some time ago before I bought it though.
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08-25-2003, 10:39 AM | #15 |
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My radiator repairmen tells me that he has seen the nipples on the radiators mainly on vehicles with AC. It also makes sense that automatics could benefit from the return being in the radiator. If it were my vehicle and it had air, I would want the nipple on the radiator.
Jim |
08-25-2003, 10:59 AM | #16 |
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When I ordered mine it had the return to the radiator , it was a Modine .
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08-25-2003, 11:11 AM | #17 |
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Now, I am confused.
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08-25-2003, 12:12 PM | #18 |
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I have had a few automatics and none of them had a return line for the heater core on the radiator. Only tranny fluid lines to them. They all had the set up of the heater core hose going back to the waterpump.
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08-25-2003, 12:21 PM | #19 |
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Mine (no A/C) had the heater hose nipple and I replaced it (2 core) with a 4 core radiator with no nipple so I took it to the local radiator shop to have one installed. I lucked out as the guy did it for free.
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08-25-2003, 02:04 PM | #20 |
WHYBYNU when old will do?
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I bought a replacement radiator for my truck a month or two ago. It came with the heater line fitting on it, as well as the tranny cooler line fittings. The old one I removed had the same setup. My truck has a 350/AT and no A/C. Now only if I hadn't dropped the old Voltage Regulator, which put a pinhole leak in the brand new radiator. Doh!
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08-25-2003, 05:10 PM | #21 |
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Well, my Jimmy has A/C and auto and Im gonna try rerouting the heater core return to the water pump and see what she does. I figure it being a 4-core and all, it will probably cool just fine. Also, Im getting a lower degree thermostat to compensate for the higher volume of water going thru the water pump now!
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08-25-2003, 05:15 PM | #22 |
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I just went through this exact same thing on the board a few weeks back. You can route the one through the intake and the other goes in through your water pump plug. I have seen both automatics and manual trannies with this exact same setup. It will work!!
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08-25-2003, 05:29 PM | #23 |
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(A) Modine still makes the radiator with a nipple.
(B) OK to feed back into the water pump--no biggie! (C) If you really want the nipple, take it to a radiator shop--(cheaper than return shipment if it was shipped to you)
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08-25-2003, 06:47 PM | #24 |
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I didn't have a fitting in the radiator I took out, but did on the new 4 core I got at Pomona. Just got a cap for it and secured it with a hose clamp.
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08-25-2003, 08:02 PM | #25 |
Not Dusti,just Bob
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Radiator
I had to go check what was in my truck,some previous owner replaced the original one with 1 that has the nipple on the radiator that is blocked off and has the conections for auto tranny lines that are not being used since its a 4-speed.
Just adding more to the confusion Bob W
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